How itching is produced and what role it plays in our body is still unknown.
Because skin is the first line of anti-infection, a large number of white blood cells gather here to attack bacteria and viruses that invade the human body. Sometimes the skin will overreact, leading to inflammatory skin diseases, such as dermatitis and psoriasis.
As we all know, stress can easily lead to diseases, from the common cold to cancer. The researchers pointed out that stress can also aggravate skin diseases through a large number of immune cells in the skin. To verify this, scientists put pressure on some mice and found that there were indeed more white blood cells in their skin. By blocking two kinds of protein LFA- 1 and ICAM- 1 which attract immune cells into the skin, scientists have successfully prevented the pressure-induced increase of white blood cells in the skin. In a word, these data show that stress can stimulate immune cells and avoid skin diseases. Scientists published this discovery in the June issue of the American Journal of Pathology 165438+ 10.
Previous studies have found that some nerve fibers specifically make us feel this uncomfortable itching. Scientists have found that protein histamine released during allergic reaction can give orders to some itchy nerves, and transmit this itching sensation to the spinal cord, and then to the brain through the spinal cord. However, histamine is not the only compound that causes itching. Scientists have found that nerve fibers sensitive to itching can stimulate itching in a different way from histamine.
Here are some factors that cause itching: mosquito or lice bites, poison ivy irritation, dry skin, wearing jewelry, herpes, stress and anxiety, staphylococcal infection, psoriasis, sunburn, and soap and hand sanitizer. According to the American Medical Association, people often overuse soap. In fact, mild lotion or water is enough to clean our skin.